You can mute the local microphone during an active call so that the other party cannot hear you, but you can still hear the other party.
To mute a call:
- Press
during an active call. - LED indicators illuminate solid red. The LCD screen indicates that the call is now muted.
To un-mute a call:
- Press
again to un-mute the call.
To mute a call if you use expansion microphones:
- Press
on the phone or tap 
on the top of the expansion microphone during an active call.
- LED indicators on the phone and the mute indicator LED on the expansion microphone illuminate solid red.
To un-mute a call if you use expansion microphones:
- Press
on the phone or tap 
on the top of the expansion microphone again to un-mute the call.